Biting while nursing HELP!!

My little one has cut 2 teeth and has started biting. I unlatch her and firmly say no biting. Then try again in a few minutes. She doesn't take bottles won't latch with a nipple shield and it really fucking hurts. She is 7 months. I notice its towards the end of a feed so I try to unlatch her before she bites but she always wants back on so then ai offer it back and she will bite me shortly after. What do I do her teeth are pretty sharp little things!